Performance register
The memory space for performance event counts, including 15-min current performance
register, 24-hour current performance register, 15-min historical performance register,
24-hour historical performance register, UAT register and CSES register. The object of
performance event monitoring is the board functional module, so every board functional
module has a performance register. A performance register is used to count the
performance events taking place within a period of operation time, so as to evaluate the
quality of operation from the angle of statistics.
performance threshold
A limit for generating an alarm for a selected entity. When the measurement result
reaches or exceeds the preset alarm threshold, the performance management system
generates a performance alarm.
Permanent Virtual
Connection
A connection between two ATM end hosts. The connection consists of PVPs between
the ATM end hosts and their respective switches, and SVPs between the switches.
PGND
Protection Ground
PGND cable
A cable which connects the equipment and the protection grounding bar. Usually, one
half of the cable is yellow, whereas the other half is green.
PIM-SM
Protocol Independent Multicast-Sparse Mode
PIR
Peak Information Rate
plesiochronous
Qualifying two time-varying phenomena, time-scales, or signals in which corresponding
significant instants occur at the same rate, any variations in rate being constrained within
specified limits. Note: Corresponding significant instants are separated by time intervals
having durations which may vary without limit.
Plesiochronous Digital
Hierarchy
A multiplexing scheme of bit stuffing and byte interleaving. It multiplexes the minimum
rate 64 kit/s into the 2 Mbit/s, 34 Mbit/s, 140 Mbit/s, and 565 Mbit/s rates.
PLL
Phase-Locked Loop
Pointer
An indicator whose value defines the frame offset of a virtual container with respect to
the frame reference of the transport entity on which this pointer is supported.
POS
Packet Over SDH
Power box
A direct current power distribution box at the upper part of a cabinet, which supplies
power for the subracks in the cabinet.
Power distribution unit
A unit that performs AC or DC power distribution.
PPP
Point-to-Point Protocol
PRBS
PRC
Primary Reference Clock
Primitive
In the hierarchy of signaling system No.7, when the upper layer applies for services from
the lower layer or the lower layer transmits services to the upper layer, the data is
exchanged between the user and the service provider. The data transmitted between
adjacent layers is called primitive.
Private Line
A line, such as a subscriber cable and trunk cable, which are leased by the
telecommunication carrier and are used to meet the special user requirements.
Protection path
A specific path that is part of a protection group and is labeled protection.
Protection service
A specific service that is part of a protection group and is labeled protection.
OptiX OSN 550 Multi-Service CPE Optical Transmission
System
Configuration Guide
A Glossary and Acronyms
Issue 02 (2011-06-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
A-23